The river Yamuna, a major tributary of the Ganges, comes down to Delhi from the Himalayas. Its been coming down for over 50 million years , running its banks during the monsoon , swollen with water and depositing sands on its floodplain. This sandy layer on top is now about 40 meters deep and 100sq km in area - that's a lot.

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Findings

Official area of floodplains = 97 sq. km.
Area of floodplains measured from TAPAS maps = 88 sq. km.
Area  of floodplains Encroached = 9.2 sq. km. 
Actual Remaining Area of floodplains = 78.8 sq. km.

(Note: Areas calculated are approximate.)